磁场作用下微柱阵列表面的浸润效应
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- 论文作者：李兴济 ; 陈少华
- 年：2017
- 作者机构：中国科学院力学研究所非线性国家重点实验室;北京理工大学先进结构技术研究院;
- 论文关键词：微柱阵列表面 ; 接触角滞后 ; Cassie-Baxter状态 ; Surface Evolver ; 可逆调控
- 会议召开时间：2017-01-14
- 会议录名称：北京力学会第二十三届学术年会会议论文集
- 语种：中文
- 分类号：O647
- 学会代码：BJLH
- 会议名称：北京力学会第二十三届学术年会
- 会议地点：中国北京
- 主办单位：北京力学会
- 学会名称：北京力学会
- 页数：4
- 文件大小：3040k
- 原文格式：D
- 会议级别：地方
摘要
通过对自然界各种奇特的生物表面的研究,研究者已经仿制出具有强黏附和超疏水性的仿生微柱阵列表面。为了进一步实现仿生表面的功能化,需要人工调控其表面性能的强弱。在已有的实验中,通过磁场,可以可逆调控磁颗粒修饰的微柱阵列表面的形貌,实现黏附、浸润性能调控。本文从理论方面,利用最小势能原理,建立了磁场与微柱变形的微分方程。经过二维理论模型和Surface Evolver数值模拟,证明了当微柱倾斜超过临界值时,三相接触线将发生移动,具体形式与液滴的固有接触角有关。以此为基础,利用改进的Cassie-Baxter方程,定量给出了随微柱倾角增加,浸润性能的改变趋势。并且发现液滴沿微柱倾斜方向的滚动能力,优于相反方向,并随着倾角增大,各向异性有进一步扩大的趋势。本文为实现表面性质可逆调控,液滴定向输运提供了理论基础,可指导仿生表面功能化的设计。
引文
1 Barthlott W,Neinhuis C.Purity of the sacred lotus,or escape from contamination in biological surfaces[J].Planta,1997,202(1):1-8.
2 Zheng Y M,Gao X F,Jiang L.Directional adhesion of superhydrophobic butterfly wings[J].Soft Matter,2007,3(2):178-182.
3 Wang Q B,Yao X,Liu H,et al.Self-removal of condensed water on the legs of water striders[J].Proceedings of the National Academy of Sciences of the United States of America,2015,112(30):9247-9252.
4 Chu K H,Xiao R,Wang E N.Uni-directional liquid spreading on asymmetric nanostructured surfaces[J].Nature Materials,2010,9(5):413-417.
5 Contraires E,Teisseire J,Sondergard E,et al.Wetting against the nap-how asperity inclination determines unidirectional spreading[J].Soft Matter,2016,12(28):6067-6072.
6 Drotlef D M,Blumler P,Papadopoulos P,et al.Magnetically Actuated Micropatterns for Switchable Wettability[J].Acs Applied Materials&Interfaces,2014,6(11):8702-8707.
7 Kim J H,Kang S M,Lee B J,et al.Remote Manipulation of Droplets on a Flexible Magnetically Responsive Film[J].Scientific Reports,2015,5.
8 Choi W,Tuteja A,Mabry J M,et al.A modified Cassie-Baxter relationship to explain contact angle hysteresis and anisotropy on non-wetting textured surfaces[J].Journal of Colloid and Interface Science,2009,339(1):208-216.
2 Zheng Y M,Gao X F,Jiang L.Directional adhesion of superhydrophobic butterfly wings[J].Soft Matter,2007,3(2):178-182.
3 Wang Q B,Yao X,Liu H,et al.Self-removal of condensed water on the legs of water striders[J].Proceedings of the National Academy of Sciences of the United States of America,2015,112(30):9247-9252.
4 Chu K H,Xiao R,Wang E N.Uni-directional liquid spreading on asymmetric nanostructured surfaces[J].Nature Materials,2010,9(5):413-417.
5 Contraires E,Teisseire J,Sondergard E,et al.Wetting against the nap-how asperity inclination determines unidirectional spreading[J].Soft Matter,2016,12(28):6067-6072.
6 Drotlef D M,Blumler P,Papadopoulos P,et al.Magnetically Actuated Micropatterns for Switchable Wettability[J].Acs Applied Materials&Interfaces,2014,6(11):8702-8707.
7 Kim J H,Kang S M,Lee B J,et al.Remote Manipulation of Droplets on a Flexible Magnetically Responsive Film[J].Scientific Reports,2015,5.
8 Choi W,Tuteja A,Mabry J M,et al.A modified Cassie-Baxter relationship to explain contact angle hysteresis and anisotropy on non-wetting textured surfaces[J].Journal of Colloid and Interface Science,2009,339(1):208-216.